Jackon Insulation insulates a passive house near Rennes

The architect Gwenn Flachot built his own house in solid wood panels. Built in Gosné (35), a few kilometers from Rennes, the building constitutes the prototype of a model marketed today under the Dreist brand at a price of around 1 euros including tax / m².

The architect built his house on land located in the town center of Gosné in Ille-et-Vilaine. For this passive construction, Gwenn Flachot took into account various factors, such as a bioclimatic orientation, a compact architecture, materials with high inertia, reinforced insulation and high-performance glazing.

An insulated concrete slab

Gwenn Flachot, manager of GF Architecture, is a fan of passive houses. Construction work on his show house began in July 2012.

With a living area of 137 m² on two floors, this type of house is an ideal place to live for a family. "For the concrete slab with a thickness of 24 cm, we opted for the JACKODUR Atlas system, which enabled us to provide insulation in the base with 25 cm of polystyrene", testifies the architect. “JACKODUR Atlas is a simple and quick solution to implement for maximum efficiency in reducing thermal bridges at the base of foundations,” he continues.

Thermal insulation from the foundations

When designing his show house, the architect opted for high-quality, durable insulation, a choice of paramount importance for this type of construction. Here, the insulation is no longer confined only to the facades since it already begins under the load-bearing slab. "Anyone who wants to meet the requirements of the passive house absolutely needs efficient perimeter insulation", explains the architect. Its choice fell on the thermal insulation and formwork system JACKODUR Atlas, certified by the Passive House Institute in Darmstadt. The exceptional insulation values, the connections without thermal bridges, as well as the easy and very efficient installation were decisive in the final choice of the architect.

For the insulation of the walls and the attic, the architect used rock wool. The walls are insulated from the outside with two crossed layers of 120 mm and 180 mm. In the attic, Gwenn Flachot has also opted for 30 cm of rock wool.

Optimal use in all circumstances

JACKODUR Atlas is made of hard extruded polystyrene (XPS) foam and can withstand all construction loads transmitted to the ground. In addition to its exceptional insulating capacities, the insulating panels are particularly resistant to compression, have foolproof dimensional stability and are perfectly waterproof and rot-proof in a humid environment. This durable and ecological material is therefore ideal for use in areas in contact with the earth.

A unique interlocking technique for easy and economical installation

JACKODUR Atlas is distinguished by a unique installation technique. Thanks to its patented interlocking technique, assembly is carried out in record time. The combination of thermal insulation and formwork effectively reduces the installation to a single step. Finally, thanks to its exceptional thermal performance, just one coat is enough. While the standards relating to passive houses impose an insulating layer under the 240 mm load-bearing slab, JACKON offers panels up to 320 mm, a significant advantage for professionals.

The implementation takes place in two stages, worthy of a breeze. The insulation panels are then laid to fill the space and form a flat surface. The height of the assembly is delimited by the formwork elements. Thanks to a simple and intelligent interlocking game, each element is held in place without gluing or additional fixing, even during the setting in concrete.